| 摘要 |
Various LED luminous elements, even those having a series connection of individual LEDs, are known. In general, a special ballast or driver electronics (power LED driver and voltage transformation) is provided. Therefore, in practice, a LED luminous element which is operated without DC current control at low voltage, is universally applicable independently from other technical conditions and can be easily expanded/retrofitted, is lacking. In order to allow a direct connection of the light source according to the invention to the 230V/50Hz or 120V/60Hz AC network and in order to ensure a safe operation and an easy adaptation to user requirements when mounting a light source, said light source comprises a series connection which is connected to a bridge rectifier (GL) and comprises at least two LED arrays (AL1, AL2), which have several interconnected individual LEDs, and a pre-resistor (R1), which are arranged on a plate-like, electrically contacting carrier (T) that dissipates heat, has protection against contact and carries at least the LED arrays (AL1, AL2). For direct operation in an AC network, the sum of the flow voltages of the LED arrays (U1...Un) is dimensioned such that it corresponds to at least 75%, preferably 80%, and to a maximum of 85% of the amplitude of the rectified alternating voltage at nominal voltage, and the LED array strip (AL1, AL2) becomes conductive only when the sum of flow voltages is exceeded, together with the setting of the filter coefficients (h[0],.., h[L-1]). The invention is in the area of LED luminous elements and lamps embodied therewith. |
